Refrigerant compressor



' y 1936- w. HIRJCHE 2,041,128

REFRIGERANT COMPRESSOR Filed Sept. 5, 1931 W 'w' g Patented May 19,1936

REFRIGERANT ooMPnEsson Willy Hirche, Leopoldshain, near Gorlitz,

Germany Application September 5, 1931, Serial No. 561,453 In GermanySeptember 10, 1930 1 Claim.

This invention relates to a novel refrigerant compressor, in whichobjection is overcome in that the electric motor is situated in agasproof casing, whichis removably fitted on the 5 compressor casing.The motor lies removably on the compressor shaft, the shaft bearingsbeing all in the compressor casing which is packed at the point wherethe driving shaft passes, so

7 that neither oil nor cooling medium can pass into the casing or, ifthis is removed for the purpose of changing the motor inthe'event ofdamage, into the atmosphere, and' air cannot penetrate into thecompressor casing.

, An embodiment of the invention is illustrated I diagrammatically inthe only figure of the accompanying drawing.

, The compressor l is here shown as an ordinary piston compressor withcrank-shaft. It is evident, that a rotary piston compressor or the likemay be employed. Casing 2 is gas-tightly closed. The armature I of themotor is slipped onto the shaft 4 by means of a sleeve, so that it caneasily be removed. The armature l and the stator winding 8 areaccommodated in a common compartment 12 of the casing 2. The

casing 2 is gas tightly fitted at 9 on the compressor casing. Thecompressor wall ll extends continuously from one end to the other, or isdivided at the connecting point 9 with the motor casing 2. The interiorspace .3 of the compressor receives the cooling medium or oil, or both.The compressor shaft 4 serves at the same time as armature shaft of themotor. The shaft 4 runs in bearings 5 and 6 arranged inside thecompressor casing. A suitably constructed shaft packing I0 is providedbetween the-compressor and motor casings.

If, for any reasons, the electric motor has to be removed, this can beeffected in a simple manner, as the packing l0 does not permit of oiland cooling medium leaking from the compressor and protects thecompressor against the penetration of air. There are also no bearings onthe motor which might cause trouble during tion can take place betweenthe compressor casing and the atmosphere, but in this instance smallquantities of cooling medium may penetrate into the motor casingwhich'however can- 10 not prove detrimental if the motor .is suitablyconstructed. When employing S02 as cooling medium, the motor can beprotected against the S02 by simple normal means.

The crank case 3 is packed against the at- 15 mosphere by the wall llhaving at its lower end an aperture closed by a removable plug l3. Theinner space l2 of the motor casing is likewise packed against theatmosphere by the wall 2. The crank case 3 and the space l2 of the motor20 casing are protected and separated by a wall which belongs either tothe casing 2 or to the casing ll. At the point at which this gas-proofpartition is mounted, through which the common shaft 4 extends, theshaft packing I0 is 25 arranged. This novel construction thereforepossesses all the advantages of a gas-tightly closedrefrigerant'compressor and nevertheless allows the drivingmotor to beeasily exchanged.

I claim: 30

A refrigerating compressor comprising in combination a compressorcasing, a compressor shaft projecting from said compressor casing, amotor comprising a rotor and a stator, said rotor mounted directly onthe projecting end of said 35 shaft, a gasand oil-tight motor casingsurrounding said motor, carrying the stator of the motor and removablyattached to said compressor casing, bearings for said shaft in saidcompressor casing, and a gas and oil-tight pack-- 40 ing at the pointwhere said shaft'passes from said compressor casing into said motorcasing.

, WILLY HIRCHE.

